Use to reduce the size of the conduit hole knockout opening in a steel outlet box or other metal enclosure. Must use one inside the enclosure opening and one on the outside. UL Listed, CSA Approved.

Used to reduce the size of the conduit hole opening in a steel outlet box or other metal enclosure. Must use one inside the enclosure opening and one on the outside. All steel construction. Zinc electro plated for corrosion protection.